<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div></div>
    <script>
        console.log(location.search);//返回参数?uname=andy
        //1、截取字符串，去掉问号得uname=andy
       var params = location.search.substr(1);
       console.log(params);
       //2、利用split('=')将字符串分割为数组
       var arr = params.split('=');
       console.log(arr);
       //2、把数据写入div中
       var div = document.querySelector('div');
       div.innerHTML = arr[1]+ '欢迎您！';

    </script>
</body>
</html>